“One of the keys to communication is invitation.”

When you wish to share something with your spouse, invite them to talk, first.
They might be involved in something else and are unable or unwilling to interrupt what they are doing in the moment.
Starting to talk without an invitation may put them in a bind. They don’t wish to disappoint you.
They may be available to talk later, just not now.

So, invite them with a, “Do you have time to talk?” Allow them to respond to your invitation with a, “Yes, and I need about half an hour more. I’ll come and get you when I’m done. Thanks.”